/** 定义颜色 */
@c10: #002329;
@c9: #E3F2FD;
@c8: #BBDEFB;
@c7: #90CAF9;
@c6: #64B5F6;
@c5: #42A5F5;
@c4: #2196F3;
@c3: #1E88E5;
@c2: #0288D1;
@c1: #0277BD;
@g5: #c0c0c0;
@cf: #ffffff;
@cf5: #edebeb;
@242:rgb(242,242,242);
@ffc:#FFC71C;
@666:#666EE8;
/** 定义一个相对定位方法 */
.rel() {
    display: block;
    position: relative;
}

/** 清除浮动的方法 */
.clear() {
    &::after {
        content: '';
    
        clear: both;
        width: 0;
        height: 0;
    }
}